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More details from the black box recordings from the crashed Germanwings jet have revealed how everything seemed ordinary as the flight took off but it ended with the horror of the pilot screaming "open the damn door".

The Germanwings flight started like any other, the conversation in the cockpit normal, with co-pilot Andreas Lubitz offering no indication of the horror he would allegedly inflict.

This is how Flight 4U 9525, which investigators believe Lubitz deliberately steered into a French mountainside, unfolded according to French prosecutors and Germany's Bild newspaper.

Both accounts are based on information from the cockpit voice recorder captured by one of the black boxes discovered among debris of the Airbus A320 that crashed in the Alps Tuesday.

- Captain Patrick S. apologises to passengers for a 26-minute delay in take-off and says they will try to catch up the time during the flight from Barcelona to Düsseldorf, Sunday's Bild said.

- The plane took off at around 10am local time and for the first 20 minutes the pilots "spoke in a normal fashion, courteous, like normal pilots. There was nothing abnormal," French prosecutor Brice Robin told reporters on Thursday.

- According to excerpts published by Bild on Sunday, during the conversation the captain said he didn't have time to go to the toilet before leaving Barcelona and Lubitz offered to take over at any time.

- At 10.27 am local time (0827 GMT), the plane reaches its cruising altitude of 11,600 metres (38,000 feet) and the captain asks Lubitz to begin preparations for landing, according to Bild.

- The responses from Lubitz remained normal, but "very short... not a real dialogue," Robin said.

- According to Bild, the co-pilot is heard saying, among other things, "hopefully" and "let's see". After checks for the landing, he is heard telling the pilot he can go now. Two minutes pass and the pilot then says to Lubitz "you can take over".

- Bild and Robin said the sound of a seat being moved back is heard and a door closing. "We can assume he left to answer nature's call," Robin told reporters.

- At 10.29, the plane begins to descend, Bild noted.

- The French prosecutor believes that, once left alone, Lubitz turned a button on the flight monitoring system that began the plane's descent.

"This action can only be deliberate," Robin said. "It would be impossible to turn the button by mistake. If you passed out and leaned over on it, it would only go a quarter-way and do nothing."

- The Airbus A320 jet descended rapidly for eight minutes, according to the low-cost carrier Germanwings.

(Photo: AFP)

- At 10.32, air traffic controllers try to make contact with the plane but receive no reply and an automatic alarm is heard going off at almost the same time, according to Bild.

- The newspaper said that shortly afterwards there was a loud bang, like someone trying to open the door and re-enter the cockpit. The captain can be heard shouting "For God's sake, open the door", as passengers' screams begin to be heard in the background.

- Contrary to Bild's report French prosecutor Robin said initially that passengers would have been unaware anything was wrong until the final moments, as the plane dropped gradually from around 10-12,000 metres to 2,000 slowly enough.

- Robin had indicated last week that the black box recorded increasingly frantic attempts by the pilot to break down the heavily reinforced door as per international standards, to which Lubitz made no response.

- At 10.35, Bild said "loud metallic blows" against the cockpit door can be heard, with another alarm sounding about 90 seconds later. At around 5,000 metres altitude, the pilot is heard screaming "open the damn door".

(Inside an Airbus 320. Photo: AFP)

- At 10.38, Bild's account indicates the sound of Lubitz's breathing but him saying nothing. "He does not say a single word. Total silence," Robin said of the co-pilot during the descent.

- Around 10.40, the plane hits a mountain and passengers' screams are heard -- the last sounds on the recording, according to Bild.